Hello Freesurfers,
 
I'm trying to mask the rawavg.mgz from some subjects with  the brain.mgz after doing some manual segmentation corrections by using mri_mask command, I have donne it before and it always works but with this subject, the command line is excacly the same so I have no idea what could be wrong:
 
mri_mask rawavg.mgz brain.mgz outbrain.mgz
 
ERROR: dimension mismatch between source and mask.

 Can any one help me with this?
 
Bests,
Gabriel